Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Shift Lever Does Not Move with Brake Pedal Depressed
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Transmission Shift Lock Control Schematics Connector End View Reference: Automatic Transmission Shift Lock Control Connector End Views or Lighting Systems Connector End Views in Lighting Systems | |||
| 1 | Did you perform the Symptoms- Automatic Transmission Shift Lock Control tests and perform all the necessary inspections? | Go to Step 2 | Go to Symptoms - Automatic Transmission Shift Lock Control |
| 2 | Turn ON the ignition, with the engine OFF. Press and hold the brake pedal. Attempt to move the shift lever out of the PARK position. Does the shift lever move out of the PARK position? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Do the stop lamps operate properly? | Go to Step 4 | Go to Diagnostic Starting Point - Lighting Systems in Lighting Systems. |
| 4 | Turn OFF the ignition. Connect a test lamp between the automatic transmission shift lock control module voltage supply circuit at the automatic transmission shift lock control module connector and a good ground. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? | Go to Step 5 | Go to Step 8 |
| 5 | Turn OFF the ignition. Connect a test lamp between the automatic transmission shift lock control module voltage supply circuit and the automatic transmission shift lock control module ground circuit at the automatic transmission shift lock control module connector. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate? | Go to Step 6 | Go to Step 9 |
| 6 | Connect a test lamp between the automatic transmission shift lock control input signal circuit at the harness connector of the automatic transmission shift lock control module and a good ground. Press and release the brake pedal several times while observing the test lamp. Does the test lamp turn ON and OFF with the brake pedal? | Go to Step 7 | Go to Step 10 |
| 7 | Inspect for poor connections at the harness connector of the automatic transmission shift lock control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11 |
| 8 | Repair the open or short to ground in the automatic transmission shift lock control module voltage supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | |
| 9 | Repair the open in the automatic transmission shift lock control module ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | |
| 10 | Repair the open or short to ground in the automatic transmission shift lock control input signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | |
| 11 | Replace the automatic transmission shift lock control module. Refer to Shift Lock Control Module Replacement . Did you complete the replacement? | Go to Step 12 | |
| 12 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 3 |
Shift Lever Does Not Move with Brake Pedal Depressed
Shift Lever Can Be Moved without Brake Pedal Depressed
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Automatic Transmission Shift Lock Control Schematics Connector End View Reference: Automatic Transmission Shift Lock Control Connector End Views or Lighting Systems Connector End Views in Lighting Systems | |||
| 1 | Did you perform the Symptoms- Automatic Transmission Shift Lock Control tests and perform all the necessary inspections? | Go to Step 2 | Go to Symptoms - Automatic Transmission Shift Lock Control |
| 2 | Turn ON the ignition, with the engine OFF. Apply the parking brake and block the wheels. Attempt to move the shift lever out of the PARK position. Does the shift lever move out of the PARK position? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 | Connect a test lamp between the automatic transmission shift lock control input signal circuit at the harness connector of the automatic transmission shift lock control module and a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 4 |
| 4 | Inspect for poor connections at the harness connector of the automatic transmission shift lock control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
| 5 | Repair the short to voltage in the automatic transmission shift lock control input signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 7 | |
| 6 | Replace the shift lock control module. Refer to Shift Lock Control Module Replacement . Is the repair complete? | Go to Step 7 | |
| 7 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 3 |
Shift Lever Can Be Moved without Brake Pedal Depressed
Automatic Transmission Shift Lock Control System
The automatic transmission shift lock control is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components
- The stop lamp switch
- The automatic transmission shift lock control module
With the ignition in the ON position battery positive voltage is supplied to the automatic transmission shift lock control module. The automatic transmission shift lock control module is also permanently grounded. When the brake pedal is depressed the contacts in the stop lamp switch close and voltage is supplied to the automatic transmission shift lock control module through the shift lock control input signal circuit. With the shift lever in the PARK position the internal park switch contacts are closed allowing voltage to flow to the internal shift lock control solenoid. The internal shift lock control solenoid is permanently grounded within the automatic transmission shift lock control module. With power and ground supplied the shift lock control solenoid energizes. This releases the mechanical lock and allows the shift lever to be moved out of the PARK position. When the shift lever is out of the PARK position the internal park switch contacts open, This de-energizes the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid will not reactivate until the shift lever is returned to the PARK position and the automatic transmission shift lock control module receives an input signal from the stop lamp switch.